Scale-Up, Production, and Procurement of PEP Simulants

Scheele, R.D.; Brown, G.N.; Kurath, Dean E.

doi:10.2172/968207

Cited by 8 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The PEP simulant involved making a precipitated iron-rich sludge (Scheele et al 2009) and adding gibbsite, boehmite, CrOOH, and various sodium salts. The leaching and washing steps in the PEP pretreatment process removed the gibbsite, some of the boehmite, most of the CrOOH, and the majority of the sodium salts from the solids phase ).…”

Section: Iron-rich Sludge Preparationmentioning

confidence: 99%

“…The iron-rich sludge fraction of the simulant was manufactured by NOAH Technologies Corporation using the first part of the recipe detailed in Appendix A of Scheele et al (2009) up through the hydroxide neutralization step. The trace quantities of Ce, La, and Nd used in the PEP simulant were omitted to reduce cost and schedule delays.…”

Section: Iron-rich Sludge Preparationmentioning

confidence: 99%

See 1 more Smart Citation

Small-Scale Spray Releases: Initial Aerosol Test Results

Mahoney¹,

Gauglitz²,

Kimura³

et al. 2012

Self Cite

View full text Add to dashboard Cite

One of the events postulated in the hazard analysis at the Waste Treatment and Immobilization Plant (WTP) and other U.S. Department of Energy (DOE) nuclear facilities is a breach in process piping that produces aerosols with droplet sizes in the respirable range. The current approach for predicting the size and concentration of aerosols produced in a spray leak involves extrapolating from correlations reported in the literature. These correlations are based on results obtained from small engineered spray nozzles using pure liquids with Newtonian fluid behavior. The narrow ranges of physical properties on which the correlations are based do not cover the wide range of slurries and viscous materials that will be processed in the WTP and across processing facilities in the DOE complex.Two key technical areas were identified where testing results were needed to improve the technical basis by reducing the uncertainty due to extrapolating existing literature results. The first technical need was to quantify the role of slurry particles in small breaches where the slurry particles may plug and result in substantially reduced, or even negligible, respirable fraction formed by high-pressure sprays. The second technical need was to determine the aerosol droplet size distribution and volume from prototypic breaches and fluids, specifically including sprays from larger breaches with slurries where data from the literature are scarce.To address these technical areas, small-and large-scale test stands were constructed and operated with simulants to determine aerosol release fractions and net generation rates from a range of breach sizes and geometries. The properties of the simulants represented the range of properties expected in the WTP process streams and included water, sodium salt solutions, slurries containing boehmite or gibbsite, and a hazardous chemical simulant. The effect of antifoam agents was assessed with most of the simulants. Orifices included round holes and rectangular slots. For the combination of both test stands, the round holes ranged in size from 0.2 to 4.46 mm. The slots ranged from (width × length) 0.3 × 5 to 2.74 × 76.2 mm. Most slots were oriented longitudinally along the pipe, but some were oriented circumferentially. In addition, a limited number of multi-hole test pieces were tested in an attempt to assess the impact of a more complex breach. Much of the testing was conducted at pressures of 200 and 380 psi, but some tests were conducted at 100 psi. Testing the largest postulated breaches was deemed impractical because of the much larger flow rates and equipment that would be required.This report presents the experimental results and analyses for the aerosol measurements obtained in the small-scale test stand. It includes a description of the simulants used and their properties, equipment and operations, data analysis methodologies, and test results. The results of tests investigating the role of slurry particles in plugging small breaches are reported in Mahoney et al. (2012). The results of the...

show abstract

Section: Iron-rich Sludge Preparationmentioning

confidence: 99%

Section: Iron-rich Sludge Preparationmentioning

confidence: 99%

Small-Scale Spray Releases: Initial Aerosol Test Results

Mahoney¹,

Gauglitz²,

Kimura³

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…Supporting documentation for the production and procurement of this simulant can be found in Scheele et al (2009). The PEP test slurry was unused test material left over from PEP testing activities.…”

Section: Waste Simulantmentioning

confidence: 99%

Filtration Understanding: FY10 Testing Results and Filtration Model Update

Daniel¹,

Billing²,

Burns³

et al. 2011

View full text Add to dashboard Cite

SummaryThis document completes the requirements of Milestone 2-4, Final Report of FY10 Testing, discussed in the scope of work outlined in the EM31 task plan WP-2.3.6-2010-1. The focus of task WP-2.3.6 is to improve the U.S. Department of Energy's (DOE's) understanding of filtration operations for high-level waste (HLW) to improve filtration and cleaning efficiencies, thereby increasing process throughput and reducing the Na demand (through acid neutralization). Developing cleaning/backpulsing requirements will produce much more efficient operations for both the Hanford Tank Waste Treatment and Immobilization Plant (WTP) and the Savannah River Site (SRS), thereby significantly increasing throughput by limiting cleaning cycles. Indeed, current program results derived from Pacific Northwest National Laboratory (PNNL) studies indicate that a ~35% increase in filter throughput can be achieved by optimization of backpulse frequency alone. In this report, the results of FY10 testing conducted under EM31 task plan WP-2.3.6-2010-1 are presented and discussed. The scope of this work is to develop the understanding of filter fouling to allow developing this cleaning/backpulsing strategy.The overall approach to this task is:  Review previous cross-flow testing at SRS, PNNL, and other peer review journals to direct testing activities for this task. Develop a predictive model that reflects the important physical mechanisms of fouling and cleaning for use in determining effective filter cleaning strategies for a variety of feeds. Develop simulants that can result in significant irreversible fouling, but also are representative of the types of materials that are present in HLW. Test these simulants in bench-scale equipment to identify the cleaning requirements for these feeds. Develop a cleaning strategy to optimize throughput while minimizing added Na. Validate the model and operational strategy with actual waste samples as appropriate.The FY10 work discussed in the current report focused on tests that would improve understanding of filter fouling dynamics to allow development of improved filtration models. To this end, three filtration test programs were conducted to provide insight into dynamics of filter fouling and the efficacy of flux recovery operations, including both backpulsing of the filter and chemical cleaning regimens. The three testing programs were: Series 1, Long Term Fouling Tests -examined flux decline when filtering the Pretreatment Engineering Platform (PEP) waste simulant slurry for long periods of time without backpulsing. Previous filtration testing has only studied filter flux dynamics over relatively brief periods of operation (4-12 hours) with respect to expected filtration operation times at WTP (on the order of 100 hours). The aim of Series 1 testing was to answer this need. Series 2, Component Fouling Tests -determined the filtration behavior of the major components that comprise the PEP simulant. By examining each solid component separately, the nature of particle-particle and particle me...

show abstract

“…The UDS of the AZ-101 simulant of Golcar et al (2000) was provided via dry-powder solid-phase compounds, and the CBM-3 simulant was produced using a combination of the approaches. The CBM-3 simulant differs from the Pretreatment Engineering Platform (PEP) simulant , Scheele et al 2009) solely in minor trace metals of the precipitated hydroxide portion of the simulant. Subsequently, some of the reported characterizations for CBM-3 are taken from characterizations of the PEP simulant.…”

Section: Simulant 1 Selectionmentioning

confidence: 99%

Hanford Sludge Simulant Selection for Soil Mechanics Property Measurement

Wells¹,

Russell²,

Mahoney³

et al. 2010

Self Cite

View full text Add to dashboard Cite

SummaryThis report describes current work to select or develop two chemical sludge simulants for testing relative to problems of hydrogen gas retention and release encountered in the double shell tanks at the Hanford Site near Richland, Washington. Wastes from single shell tanks are being transferred to double shell tanks for safety reasons (some single shell tanks are leaking or are in danger of leaking), but the available double-shell tank space is limited.The current System Plan for the Hanford Tank Farms (Rev. 4, Certa and Wells 2009) uses relaxed buoyant displacement gas release event (BDGRE) controls for deep sludge (i.e., high level waste [HLW]) tanks, which allows the tank farms to use more storage space, i.e., increase the sediment depth, in some of the double-shell tanks (DSTs). The relaxed BDGRE controls are based on preliminary analysis of a gas release model from van Kessel and van Kesteren (2002). Application of the van Kessel and van Kesteren model requires parametric information for the sediment, including the lateral earth pressure at rest and shear modulus. No lateral earth pressure at rest and shear modulus in situ measurements for Hanford sludge are currently available.The two chemical sludge simulants will be used in follow-on work to experimentally measure the van Kessel and van Kesteren (2002) model parameters, lateral earth pressure at rest, and shear modulus. The simulants are selected via similarity to measured Hanford sludge chemical and physical properties, including liquid density, viscosity, and pH, undissolved particle size and density, and slurry rheology to maximize the likelihood that the simulants will have similar lateral earth pressure at rest and shear modulus as Hanford sludge. Simulant 1 is selected from those Hanford sludge simulants that have previously been produced and characterized, and Simulant 2 is developed based upon the chemistry of a specific retrieval SST scenario. In Section 2, pertinent Hanford sludge properties are summarized, Simulant 1 is selected, and the chemistry for Simulant 2 is developed and presented. Simulant production is described in Section 3, and simulant property measurements are presented in Section 4. A summary is provided in Section 5.

show abstract

Scale-Up, Production, and Procurement of PEP Simulants

Cited by 8 publications

References 10 publications

Small-Scale Spray Releases: Initial Aerosol Test Results

Small-Scale Spray Releases: Initial Aerosol Test Results

Filtration Understanding: FY10 Testing Results and Filtration Model Update

Hanford Sludge Simulant Selection for Soil Mechanics Property Measurement

Contact Info

Product

Resources

About